CVE-2026-55195
8.7
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| miurahr | py7zr | < 1.1.3 | affected |
Weaknesses
- CWE-409: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
References
- https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774
- https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b
- https://github.com/miurahr/py7zr/releases/tag/v1.1.3
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